e576be50 |
1 | /* |
2 | * query.c |
3 | * - overall query management (allocation, completion) |
4 | * - per-query memory management |
5 | * - query submission and cancellation (user-visible and internal) |
6 | */ |
7 | /* |
8 | * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2, or (at your option) |
13 | * any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software Foundation, |
22 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
23 | */ |
4353a5c4 |
24 | |
4bec51a4 |
25 | #include "internal.h" |
656b2da9 |
26 | |
e576be50 |
27 | #include <stdlib.h> |
28 | #include <unistd.h> |
29 | #include <errno.h> |
656b2da9 |
30 | |
e576be50 |
31 | #include <sys/time.h> |
656b2da9 |
32 | |
e576be50 |
33 | #include "internal.h" |
ddfda861 |
34 | |
e576be50 |
35 | int adns__internal_submit(adns_state ads, adns_query *query_r, |
3955725c |
36 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
e576be50 |
37 | adns_queryflags flags, struct timeval now, |
38 | adns_status failstat, const qcontext *ctx) { |
39 | adns_query qu; |
e576be50 |
40 | |
41 | qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory; |
42 | qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory; |
43 | |
3955725c |
44 | qu->ads= ads; |
e576be50 |
45 | qu->state= query_udp; |
46 | qu->back= qu->next= qu->parent= 0; |
47 | LIST_INIT(qu->children); |
48 | qu->siblings.next= qu->siblings.back= 0; |
49 | qu->allocations= 0; |
50 | qu->interim_allocd= 0; |
3955725c |
51 | qu->final_allocspace= 0; |
e576be50 |
52 | |
3955725c |
53 | qu->typei= typei; |
e576be50 |
54 | adns__vbuf_init(&qu->vb); |
55 | |
56 | qu->cname_dgram= 0; |
57 | qu->cname_dglen= qu->cname_begin= 0; |
4bec51a4 |
58 | |
e576be50 |
59 | qu->id= id; |
60 | qu->flags= flags; |
61 | qu->udpretries= 0; |
62 | qu->udpnextserver= 0; |
63 | qu->udpsent= qu->tcpfailed= 0; |
64 | timerclear(&qu->timeout); |
65 | memcpy(&qu->context,ctx,sizeof(qu->context)); |
e576be50 |
66 | |
67 | qu->answer->status= adns_s_ok; |
68 | qu->answer->cname= 0; |
3955725c |
69 | qu->answer->type= typei->type; |
e576be50 |
70 | qu->answer->nrrs= 0; |
71 | qu->answer->rrs= 0; |
3955725c |
72 | qu->answer->rrsz= typei->rrsz; |
e576be50 |
73 | |
74 | *query_r= qu; |
ddfda861 |
75 | |
a49a6d7b |
76 | qu->query_dglen= qumsg_vb->used; |
77 | if (qumsg_vb->used) { |
78 | qu->query_dgram= malloc(qumsg_vb->used); |
79 | if (!qu->query_dgram) { |
80 | adns__query_fail(qu,adns_s_nolocalmem); |
81 | return adns_s_ok; |
82 | } |
83 | memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used); |
84 | } else { |
85 | qu->query_dgram= 0; |
ddfda861 |
86 | } |
e576be50 |
87 | qu->vb= *qumsg_vb; |
88 | adns__vbuf_init(qumsg_vb); |
89 | |
90 | if (failstat) { |
3955725c |
91 | adns__query_fail(qu,failstat); |
92 | return adns_s_ok; |
656b2da9 |
93 | } |
3955725c |
94 | adns__query_udp(qu,now); |
e576be50 |
95 | adns__autosys(ads,now); |
96 | |
3955725c |
97 | return adns_s_ok; |
e576be50 |
98 | |
99 | x_freequ_nomemory: |
100 | free(qu); |
101 | x_nomemory: |
3955725c |
102 | adns__vbuf_free(qumsg_vb); |
103 | return adns_s_nolocalmem; |
4bec51a4 |
104 | } |
105 | |
e576be50 |
106 | int adns_submit(adns_state ads, |
107 | const char *owner, |
108 | adns_rrtype type, |
109 | adns_queryflags flags, |
110 | void *context, |
111 | adns_query *query_r) { |
112 | qcontext ctx; |
3955725c |
113 | int id, r, ol; |
e576be50 |
114 | vbuf vb; |
3955725c |
115 | adns_status stat; |
116 | const typeinfo *typei; |
117 | struct timeval now; |
e576be50 |
118 | |
3955725c |
119 | typei= adns__findtype(type); |
120 | if (!typei) return adns_s_notimplemented; |
121 | |
e576be50 |
122 | ctx.ext= context; |
123 | r= gettimeofday(&now,0); if (r) return errno; |
124 | id= 0; |
125 | |
126 | adns__vbuf_init(&vb); |
127 | |
128 | ol= strlen(owner); |
ffbda80c |
129 | if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_domaintoolong; goto xit; } |
e576be50 |
130 | |
131 | if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; } |
132 | |
3955725c |
133 | stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags); |
e576be50 |
134 | |
135 | xit: |
3955725c |
136 | return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx); |
ddfda861 |
137 | } |
138 | |
e576be50 |
139 | int adns_synchronous(adns_state ads, |
140 | const char *owner, |
141 | adns_rrtype type, |
142 | adns_queryflags flags, |
143 | adns_answer **answer_r) { |
144 | adns_query qu; |
145 | int r; |
146 | |
147 | r= adns_submit(ads,owner,type,flags,0,&qu); |
148 | if (r) return r; |
4bec51a4 |
149 | |
88372443 |
150 | r= adns_wait(ads,&qu,answer_r,0); |
3955725c |
151 | if (r) adns_cancel(qu); |
ddfda861 |
152 | |
88372443 |
153 | return r; |
e576be50 |
154 | } |
155 | |
f759e52e |
156 | static void *alloc_common(adns_query qu, size_t sz) { |
e576be50 |
157 | allocnode *an; |
158 | |
a49a6d7b |
159 | if (!sz) return qu; /* Any old pointer will do */ |
e576be50 |
160 | assert(!qu->final_allocspace); |
e576be50 |
161 | an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz)); |
e062dcae |
162 | if (!an) return 0; |
e576be50 |
163 | an->next= qu->allocations; |
164 | qu->allocations= an; |
165 | return (byte*)an + MEM_ROUND(sizeof(*an)); |
166 | } |
4bec51a4 |
167 | |
f759e52e |
168 | void *adns__alloc_interim(adns_query qu, size_t sz) { |
169 | sz= MEM_ROUND(sz); |
170 | qu->interim_allocd += sz; |
171 | return alloc_common(qu,sz); |
172 | } |
173 | |
174 | void *adns__alloc_mine(adns_query qu, size_t sz) { |
175 | return alloc_common(qu,MEM_ROUND(sz)); |
176 | } |
177 | |
e576be50 |
178 | void *adns__alloc_final(adns_query qu, size_t sz) { |
179 | /* When we're in the _final stage, we _subtract_ from interim_alloc'd |
180 | * each allocation, and use final_allocspace to point to the next free |
181 | * bit. |
182 | */ |
183 | void *rp; |
184 | |
185 | sz= MEM_ROUND(sz); |
186 | rp= qu->final_allocspace; |
187 | assert(rp); |
188 | qu->interim_allocd -= sz; |
189 | assert(qu->interim_allocd>=0); |
190 | qu->final_allocspace= (byte*)rp + sz; |
191 | return rp; |
192 | } |
193 | |
3955725c |
194 | void adns__reset_cnameonly(adns_query qu) { |
88372443 |
195 | /* fixme: cancel children */ |
9557e604 |
196 | assert(!qu->final_allocspace); |
e576be50 |
197 | qu->answer->nrrs= 0; |
198 | qu->answer->rrs= 0; |
199 | qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0; |
4353a5c4 |
200 | } |
201 | |
88372443 |
202 | static void free_query_allocs(adns_query qu) { |
203 | allocnode *an, *ann; |
204 | adns_query cqu, ncqu; |
205 | |
206 | for (cqu= qu->children.head; cqu; cqu= ncqu) { |
207 | ncqu= cqu->siblings.next; |
208 | adns_cancel(cqu); |
209 | } |
210 | for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); } |
211 | adns__vbuf_free(&qu->vb); |
212 | } |
213 | |
1dfe95d8 |
214 | void adns_cancel(adns_query qu) { |
88372443 |
215 | switch (qu->state) { |
216 | case query_udp: case query_tcpwait: case query_tcpsent: |
1dfe95d8 |
217 | LIST_UNLINK(qu->ads->timew,qu); |
88372443 |
218 | break; |
219 | case query_child: |
1dfe95d8 |
220 | LIST_UNLINK(qu->ads->childw,qu); |
88372443 |
221 | break; |
222 | case query_done: |
1dfe95d8 |
223 | LIST_UNLINK(qu->ads->output,qu); |
88372443 |
224 | break; |
225 | default: |
226 | abort(); |
227 | } |
228 | free_query_allocs(qu); |
229 | free(qu->answer); |
230 | free(qu); |
231 | } |
232 | |
3955725c |
233 | void adns__query_done(adns_query qu) { |
98a3f706 |
234 | adns_answer *ans; |
88372443 |
235 | int rrn; |
8e5b0abb |
236 | |
88372443 |
237 | ans= qu->answer; |
238 | |
239 | if (qu->interim_allocd) { |
240 | if (qu->answer->nrrs && qu->typei->diff_needswap) { |
241 | if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) { |
242 | adns__query_fail(qu,adns_s_nolocalmem); |
243 | return; |
244 | } |
245 | } |
246 | ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd)); |
e062dcae |
247 | if (!ans) { |
248 | qu->answer->cname= 0; |
249 | adns__query_fail(qu, adns_s_nolocalmem); |
250 | return; |
251 | } |
252 | qu->answer= ans; |
253 | } |
8e5b0abb |
254 | |
88372443 |
255 | qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans)); |
8e5b0abb |
256 | adns__makefinal_str(qu,&ans->cname); |
88372443 |
257 | |
8e5b0abb |
258 | if (ans->nrrs) { |
88372443 |
259 | adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz); |
8e5b0abb |
260 | |
88372443 |
261 | for (rrn=0; rrn<ans->nrrs; rrn++) |
262 | qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz); |
8e5b0abb |
263 | |
88372443 |
264 | if (qu->typei->diff_needswap) |
265 | adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz, |
266 | qu->vb.buf, qu->typei->diff_needswap); |
267 | } |
268 | |
269 | free_query_allocs(qu); |
8e5b0abb |
270 | |
4353a5c4 |
271 | qu->id= -1; |
3955725c |
272 | LIST_LINK_TAIL(qu->ads->output,qu); |
e553d072 |
273 | |
274 | assert(!qu->parent); |
275 | /* fixme: do something with the answers to internally-generated queries. */ |
656b2da9 |
276 | } |
277 | |
3955725c |
278 | void adns__query_fail(adns_query qu, adns_status stat) { |
279 | adns__reset_cnameonly(qu); |
8e5b0abb |
280 | qu->answer->status= stat; |
3955725c |
281 | adns__query_done(qu); |
656b2da9 |
282 | } |
e576be50 |
283 | |
284 | void adns__makefinal_str(adns_query qu, char **strp) { |
285 | int l; |
286 | char *before, *after; |
287 | |
288 | before= *strp; |
9557e604 |
289 | if (!before) return; |
e576be50 |
290 | l= strlen(before)+1; |
291 | after= adns__alloc_final(qu,l); |
292 | memcpy(after,before,l); |
293 | *strp= after; |
294 | } |
295 | |
3955725c |
296 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) { |
9557e604 |
297 | void *before, *after; |
e576be50 |
298 | |
9557e604 |
299 | before= *blpp; |
300 | if (!before) return; |
e576be50 |
301 | after= adns__alloc_final(qu,sz); |
9557e604 |
302 | memcpy(after,before,sz); |
e576be50 |
303 | *blpp= after; |
304 | } |